Another one of the little known uses of Google is the Calculator. The Google Calculator is a very useful tool that is actually built right into Google Search. All you need to do is type something like "1m in cm" or how about "1mile in feet" or "5739f in c" (for temperature). This will work with many mathematical measurements and is very handy when doing time consuming unit conversions.

You can also type in math equations into Google, for example "55*90+(sqrt 10)^3=" surprisingly this works quite well even on more difficult equations. So don't go out and waste your money on a fancy Calculator just type it into Google...